- Obstetricians & Gynecologists, Millville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Millville
- Office Supplies, Equipment & Office Furniture Stores, Millville
- Oil Change & Lubrication, Millville - Auto Oil & Quick Lube
- Open Bible Church, Millville
- Ophthalmologists, Millville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Millville
- Opticians, Millville
- Optometrists, Millville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Millville
- Ornamental Nursery, Millville
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- Ornamental Nursery Services, Millville
- Orthodontist, Millville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Millville
- Other Attorneys & Lawyers, Millville
- Other Attorneys & Lawyers, Millville
- Other Building Materials & Supplies, Millville
- Other Lawyers & Attorneys, Millville
- Other Lodging, Millville
- Outdoor Equipment & Accessories, Millville
- Ownership Organizations, Millville
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